The mb-ecb is one passive ethernet transmission that can transmit 10 base-t ethernet signal over one coax cable up to 642ft(196m).It allows any cctv ip camera or other ethernet devices to be connected within extended distance without power .With super interference rejection and high-end tvs for surge protection, mb-ecb can protect device from damange.In any harsh electrical areas.The device is often used in legacy installations where existing cable is re-deployed as part of an upgrade to ip cameras or other ethernet devices.Mb-ecb work in pairs .The transmission is extremely simple to use , with no ip or mac addressing required.